Esker
Linear accumulations of sediment deposited by subglacial streams, creating distinctive ridges that follow glacial drainage pathways.
Real World
The Punkaharju Esker in Finland stretches over 7 km between two lakes and is so well-preserved it has been a protected national landscape since 1843, attracting thousands of visitors annually.
Exam Focus
When describing esker formation, specify the subglacial meltwater origin and explain why sediment is sorted and stratified.
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